it stands for self addressed stamped envelope..if it's SASBE..that stands for self addressed stamped bubble envelope. You put an address label and two stamps on the inside and two stamps on the outside and mail it to the person. This is a way to get seeds from people who are passing seeds along because they have an overabundance.

Hi Quiltingfox,

Welcome to Garden web, and the seed Exchange.

There is a complete explanation of SASE, SASBE, BEAP, at the second replyhere

There is also tons of good to know info here Needing everyones input! :)

hth...hope that helps

Sue...resident busy body